Utilization of Ultra High Performance Concrete for Offshore Applications.

超高性能混凝土在海上应用中的利用。

• 批准号: RGPIN-2015-04159
• 负责人: Marzouk, Hesham
• 金额: $ 1.46万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=658951
• 关键词: Utilization; Ultra; Performance; Concrete; Offshore

The development of Ultra High Performance Fiber Concrete (UHP-FRC) is deemed as one of the most promising technological advances in material applications suitable for structural Engineering. The new material exhibits exceptional mechanical and durability properties. Concepts of particle packing using nanotechnology have been taken one step further to produce it. The enhanced ductility, impact resistance and energy absorption capacity of the new concrete makes it an ideal material for use in high resistance structures. The present research investigation will be focused on studying the concrete plate under static and impact loading. The use of thin plate can be used as a concrete form for thick mega important structures like offshore and nuclear containment structures or it can be attached to building exterior panels to produce safer more sustainable structural shield in the future.***The new material has been used for different parts on the roof, base slab and other parts of the new offshore Hebron gravity concrete platforms. UHP-FRC has an excellent resistance to spalling, scabbing, and fragmentation, making it an ideal material for wave forces and sea ice for the splash zone. The new material is very well used for offshore wind turbine structures applications.***The cracking, tension stiffening and reinforcement ratios of UHP-FRC plate are important design factors for any offshore structure. The impact loading of UHP-FRC plate under dropped weight will be investigated experimentally, analytically and numerically. Four analytical models will be developed based on the critical impact energy for radial cracking, spalling, tunneling (scabbing) and penetration. The Random Decrement (RD) method will be used determine the dynamic properties of the tested plates before and after testing. The natural frequency, damping ratio, normalized RD and normalized deflection will be determined for the tested plates at different nodes. A critical impact energy expressions will be developed after considering the change of the modulus of elasticity due to Dynamic Impact Factor (DIF) for quasi-static domain, and dynamic domain. ***A numerical investigation is being developed using a concrete damage plasticity constitutive mode suitable for large deformation. A series of laboratory tests has been conducted at Ryerson lab under supervision of the applicant to determine the identification model parameters. The damage plasticity model under strain rate dependent is considered as a modification of the Drucker-Prager strength hypothesis. Tensile and  damage parameters will be used for the model. The developed numerical FE model will be used on the simulation of the impact problem using explicit dynamic analysis technique. The long term objective will be focused on the successful development of an efficient design of a thin plate to be used as a shield against impact for important structures. ***********

超高性能纤维混凝土（UHP-FRC）的发展被视为适合结构工程的材料应用中最有希望的技术进步之一。新材料具有非凡的机械和耐用性能。使用纳米技术的粒子堆积概念已进一步生产。新混凝土的增强的延展性，抗抗性和能量吸收能力使其成为用于高电阻结构的理想材料。本研究投资将集中于在静态和撞击负荷下研究混凝土板。薄板的使用可以用作混凝土形式，用于较厚的巨型重要结构，例如离岸和核遏制结构，也可以将其连接到建筑物外面板上，以生成更安全的可持续性结构屏蔽层。 UHP-FRC具有极好的抵抗力，可抗剥落，scab和碎片，使其成为波动区域波力和海冰的理想材料。新材料非常用于海上风力涡轮机结构的应用。在减少重量下，UHP-FRC板的冲击负荷将在实验，分析和数值上研究。将根据径向裂纹，剥落，隧道（scabbing）和穿透力的关键影响能量开发四个分析模型。将使用随机减少（RD）方法确定测试前后测试板的动态特性。将确定在不同节点处的测试板的固有频率，阻尼比，标准化RD和归一化偏转。在考虑了准静态域和动态域而导致的弹性模量变化后，将开发出关键的影响能量表达式。 ***使用适用于大变形的具体损害塑性模式，正在开发数值投资。在应用程序的监督下，在Ryerson Lab进行了一系列实验室测试，以确定识别模型参数。在应变率依赖性下的损伤可塑性模型被认为是Drucker-prager强度假设的修改。该模型将使用拉伸和损伤参数。开发的数值模型将使用显式动态分析技术来模拟影响问题。长期目标将集中于成功开发薄板的有效设计，以用作抵抗对重要结构的影响的盾牌。 *****